2. ABC triunghi dreptunghic, t lui Pitagora
AC ²=AB²+BC²
AC²=144+16=160, AC=4√10
A'AC triunghi dreptunghic, t Pitagora
A'C²=A'A²+AC²
A'C=9+160=169. A'C=13 cm
3. AC+C'C=4√10+3 cm
4.v musca=AC/tm, tm timpul in care ajunge musca
tm=AC/Vmusca=13/1=13 s
tg=(AC+C'C)/vgandac=(4√10+3)/1,1≈14,21 s, deci musca ajunge mai repede